Ans-A. Lacunar infarct
This image shows a CT scan of a lacunar infarct.
Occlusion of a larger perforating vessel causes a lacunar infarct.
Acutely, lacunar infarcts are often rounded with a hazy outline and may fluctuate in size in the subacute phase— most often enlarging.
When mature, however, they become sharply delineated, shrink in size—typically less than 1.5 cm diameter—and cavity-like.
The gliotic hyperintense rim of a mature lacune on FLAIR differentiates it from a perivascular space.
IOC for Hyperacute Infarct → MRIbest sequence –DWI
Acute/hyperacute infarcts show restricted diffusion.